var GameCanvas = function(canvas_id, width, height) {
  log('creating GameCanvas in element: ' + canvas_id + ' w:' + width + ' h:' + height);
  this.canvas = document.getElementById(canvas_id);
	var context = this.canvas.getContext('2d');
	context.fillStyle = 'black';
	context.strokeStyle = 'green';
	context.fillRect(0, 0, width, height);
	context.stroke();
  
  this.render_game = function(game_context) {
    log('rendering game');
  };
}